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I was answering your specific question about "в or б; и or ы":
Really there is no additional rule for helping where в or б; и or ы must be used apart from this last case for г. х. ж ?

That is why...

The question is strange. What is a spelling rule? It is a rule which explains how to SPELL a word in case when you cannot detect it from the pronunciation. I.e. if there are some letters which are...